package com.dotndot.momserver.utils;

import java.io.*;

import javax.servlet.*;

public class SetCharacterEncodingFilter implements Filter
{
    protected String encoding = null;
    protected FilterConfig filterConfig = null;
    protected boolean ignore = true;

    public void destroy()
    {
        this.encoding = null;
        this.filterConfig = null;
    }

    public void doFilter( ServletRequest request, ServletResponse response, FilterChain chain ) throws IOException, ServletException
    {
        if( ignore || (request.getCharacterEncoding() == null) )
        {
            String encoding = selectEncoding(request);
            if( encoding != null )
                request.setCharacterEncoding(encoding);
        }
        chain.doFilter(request, response);
    }

    public void init( FilterConfig filterConfig ) throws ServletException
    {
        this.filterConfig = filterConfig;
        this.encoding = filterConfig.getInitParameter("encoding");
        String value = filterConfig.getInitParameter("ignore");
        if( value == null )
            this.ignore = true;
        else if( value.equalsIgnoreCase("true") )
            this.ignore = true;
        else if( value.equalsIgnoreCase("yes") )
            this.ignore = true;
        else
            this.ignore = false;
    }

    protected String selectEncoding( ServletRequest request )
    {
        return (this.encoding);
    }
}
